Senado BR — Brazilian Federal Senate Open Data

Empresas contratadas

senado_empresas_contratadas

Read-onlyIdempotent

Find companies that contract with the Brazilian Federal Senate by name or CNPJ/CPF. Returns company details and associated contract numbers for procurement research.

Instructions

Busca empresas que contratam com o Senado por nome (mín. 3 caracteres) ou CNPJ/CPF (busca parcial). Retorna { count, total, empresas }, cada item com id, nome, cnpj, contratos (até 30 números) e totalContratos. Exige nome ou cnpj (a base completa é grande); limitado a limite (padrão 20, máx 100). Use o id/número de contrato em senado_contratos ou senado_contratacao_detalhe para o detalhamento.

Input Schema

TableJSON Schema

Name	Required	Description
`cnpj`	No	CNPJ/CPF (busca parcial)
`nome`	No	Nome da empresa (busca parcial, mín. 3 caracteres)
`limite`	No	Máximo de empresas (padrão: 20)

Output Schema

TableJSON Schema

Name	Required	Description	Default
`provenance`	Yes
`attribution`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv3.18.4Oct 14, 2026

changedOutput schema / properties / provenance / anyOf

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Changed3 schema fields changedv3.15.2Oct 7, 2026

addedOutput schema / properties / attribution

Added value: +{
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addedOutput schema / properties / provenance

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+          "retrieved_at",
+          "retrieval",
+          "citation",
+          "license"
+        ],
+        "type": "object"
+      },
+      "minItems": 1,
+      "type": "array"
+    }
+  ]
+}

addedOutput schema / required

Added value: +[
+  "provenance",
+  "attribution"
+]

Changed3 schema fields changedv3.9.0Sep 24, 2026

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

addedInput schema / additionalProperties
```
Added value: +false
```

changedOutput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Changed2 schema fields changedv3.3.3Jul 6, 2026
- removedInput schema / additionalProperties
```
Removed value: -false
```
- changedOutput schema / additionalProperties
```
Previous value: -trueNew value: +{}
```
First observedv3.3.1Jun 25, 2026

TDQS

A4.6/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover readOnly, idempotent, non-destructive and openWorld behaviour, so the safety profile is settled. The description still adds genuinely behavioural facts: minimum 3 characters, partial matching, a hard requirement for at least one search term because of the base size, a 30-contract cap per item, and the limite bounds (padrão 20, máx 100). Return-shape detail overlaps the existing output schema, which keeps this from a 5.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three dense sentences, front-loaded with the capability before constraints and routing. Every clause earns its place, though the return-field enumeration is somewhat redundant given the output schema.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a read-only search tool with full schema coverage, full annotations and an output schema, the description supplies the remaining essentials: the mandatory search term, match semantics, page size bounds, and where to go for detail. Nothing an agent needs to invoke it correctly is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so all three parameters are already documented with types, minLength, default and maximum. The description nevertheless adds rationale the schema does not carry: why one of nome/cnpj is mandatory (the full base is large) and that matching is partial. That is real added meaning, but most parameter semantics are duplicated.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (busca) and resource (empresas que contratam com o Senado), plus the two searchable identifiers (nome, CNPJ/CPF). An agent can immediately distinguish it from the detail-oriented siblings senado_contratos and senado_contratacao_detalhe, which are explicitly named as follow-ups.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly states the precondition ('Exige nome ou cnpj') with the reason the full base cannot be enumerated, and routes the agent to senado_contratos / senado_contratacao_detalhe for deeper detail using the returned id or contract number. Nothing about when to pick this tool over its neighbours is left to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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